These tall wading birds are often silent, making them excellent stealth hunters. They may emit a low, guttural call when disturbed, but they are generally quiet
Many owl species are known for their quiet flight and lack of vocalizations. They communicate primarily through hoots, whistles, or hisses, but they are often heard less frequently than other birds.
These seabirds are known for their distinctive appearance, but they are not particularly vocal. They may make soft grunting or growling sounds during the breeding season.